<template>
    <div>
             <!-- 面包屑导航区 -->
       <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <!-- 添加角色 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>
            <!-- 角色列表区 -->
            <el-table :data="rolelist" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row v-for="(item1, i1) in scope.row.children" :key="item1.id" :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']">
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级权限和三级权限 -->
                            <el-col :span="19">
                                <!-- 通过for循环嵌套二级权限 -->
                                <el-row v-for="(item2, i2) in item1.children" :key="item2.id" :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']">
                                    <el-col :span='6'>
                                        <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                                        <i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span='18'>
                                        <el-tag type='warning' v-for="(item3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                                    </el-col>
                                </el-row>    
                            </el-col> 
                        </el-row>
                        <!-- <pre>
                            {{scope.row}}
                        </pre> -->
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                 <el-table-column type="index"></el-table-column>
                <el-table-column label="角色名称" prop="roleName"></el-table-column>
                <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
                <el-table-column label="操作" width="300">
                    <template slot-scope="scope">
                       <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                       <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                       <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
                
            </el-table>
        </el-card>
        <!-- 分配权限的对话框 -->
        <el-dialog
            title="分配权限"
            :visible.sync="setRightDialogVisible"
            width="50%"
            @close="setRightDialogClosed">
            <span>
                <!-- 树形控件 -->
                <el-tree :data="rightslist" :props="treeProps"  show-checkbox node-key="id" default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>

            </span>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>

    </div>
</template>

<script>
    export default {
        data() {
            return {
                // 所有角色列表数据
                rolelist: [],
                setRightDialogVisible: false,
                // 获取所有权限的数据
                rightslist: [],
                // 树形控件的属性绑定对象
                treeProps: {
                    label: 'authName',
                    children: 'children'
                },
                // 默认的选中节点的id值
                defKeys: [],
                // 当前即将分配权限角色的id
                roleId: ''
            }
        },
        created() {
            this.getRolesList()
        },
        methods: {
            // 获取所有角色列表
            async  getRolesList() {
                const { data: res } = await this.$http.get('roles')
                if (res.meta.status !== 200) return this.$message.error('获取角色列表失败！')

                this.rolelist = res.data
                // console.log(this.rolelist);
            },
            // 根据id 删除对应的权限
            async removeRightById(role, rightId) {
                // 弹框提示是否删除
                const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
                    confirmButtonText: '确定',
                    cancelButtonText: '取消',
                    type: 'warning'
                }).catch(err => err)
                console.log(confirmResult);
                if (confirmResult !== 'confirm') return this.$message.info('取消了删除')
                const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
                if (res.meta.status !== 200) return this.$message.error('删除权限失败')
                // 会重新获取所有数据，并渲染页面 ==> 造成刷新页面的效果
                // this.getRolesList()
                role.children = res.data
            },
            // 展示分配权限的对话框
            async showSetRightDialog(role) {
                this.roleId = role.id

                // 获取所有权限的数据
                const { data: res } = await this.$http.get('rights/tree')
                if (res.meta.status !== 200) {
                    return this.$message.error('获取数据失败')
                }
                // 获取到的权限数据
                this.rightslist = res.data
                // 获取所有的三级权限id，为初始化对话框添加默认选中
                this.getLeafKeys(role, this.defKeys)
                
                // 显示对话框
                this.setRightDialogVisible = true
            },
            // 通过递归的形式，获取角色下所有的三级权限id,并保存到defKeys数组中
            getLeafKeys(node, arr) {
                // 如果当前节点不包含children属性说明是三级节点
                if (!node.children) {
                    return arr.push(node.id)
                }
                node.children.forEach((item) => {
                    this.getLeafKeys(item, arr)
                })
            },
            // 监听分配权限对话框的关闭事件
            setRightDialogClosed() {
                this.defKeys = []
            },
            // 点击为角色分权限
            async allotRights() {
                const keys = [
                    ...this.$refs.treeRef.getCheckedKeys(), ...this.$refs.treeRef.getHalfCheckedKeys()
                ]
                const idStr = keys.join(',')
                // console.log(keys);
                // console.log(idStr, this.roleId);
                const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
                if (res.meta.status !== 200) {
                    return this.$message.error('分配权限失败')
                }
                this.$message.success('分配权限成功')
                this.getRolesList()
                this.setRightDialogVisible = false
            }
        }
     
    }
</script>

<style lang="less" scoped>
    .el-tag{
        margin: 7px;
    }
    .bdtop {
        border-top: 1px solid #eee;
    }
     .bdbottom {
        border-bottom: 1px solid #eee;
    }
    .vcenter{
        display: flex;
        align-items: center;
    }
</style>
